Re: Someone wanna check this box design for me?....

Well, for the first design, just have the port turn the corner, follow along the back of the box since it's only 21" in length.

As for the second design, you can't just duplicate one half and flip it to the other side to create a common ported chamber like ya did because the port tuning for that design would be way off what your looking to tune it to.

The second design will work if you make each chamber separate by throwing a panel in the middle otherwise, you have to recalculate design #2 for the correct port length since now you have a large volume, thus, your enclosure size increases for the increase in port displacement.